How many oz is the magnet itself

The weight of the 2 combined magnets is around 30 oZ.

how many watts please ??

Dear Sir,the rms power handling is 80 Watts. Please see the complete data below.Best regardsKlaus ReckReckhorn LTDTechnical specifications:Cast aluminum basket 175 mmTotal speaker diameter 149 mmSpeaker mounting cut out size 92 mmSpeaker mounting depths 100 mmDual magnet height 30 mmMagnet gap 8 mmMembrane and dustcap aluminum black anodizedX.-max. 8 mmVoice coil 38 mm 24 mm in four windingsPower handling 80 w rmsImpedance 1 X 4 Ohmweight 2,3 kg Thiele-Small Parameter:Re = 3,6 Ohm, Le = 1,195 mH, FS = 28 Hz, Qms = 5,69, Qes = 0,32, Qts = 0,30, Sd = 132 qcm, Vas = 17 l, Mms = 43 g, BL = 9,38 N/A. Wirkungsgrad: 83 dB 1 W / 1 m

Have you heard of anyone using this speaker to replace the 6.5" subwoofer in a bmw z3?

No, and the big magnet is too deep. Best regards Klaus Reck

What amplifier is best for this?

For our D-165 you can use all amplifiers with 30-100 watts rms and strong power supply for low frequency power. Our A-2.1 3-channel model has extra features as separate subwoofer controls and satellite power and control. Best regards Klaus Reck, Reckhorn LTD

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Reckhorn D-165 Subwoofer Chassis 175 mm (6.5 inch)

Reckhorn D-165 Subwoofer Chassis 175 mm (6.5 inch)

Product ID: 50902247

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Details

Brand
Reckhorn
Speaker maximum output power
120 Watts
Frequency response
2E+1 Hz
Connectivity technology
Audio output mode
Mono
Mounting type
Tabletop

💪80W RMS power handling

🔊175 mm precision diameter

⚙️Cast aluminium basket for durability

Description

🎶 Feel the bass, own the room with Reckhorn D-165!

OPTIMIZED VOICE COIL - 38 mm coil with 4-ply winding for superior heat dissipation and reliability
WIDE FREQUENCY RANGE - Crisp response from 20 Hz to 1000 Hz for rich sub-bass and mid-bass clarity
POWERFUL DOUBLE MAGNET - 100 mm magnet ensures deep, punchy bass with precision control
VERSATILE INSTALLATION - Fits compact to multi-driver subwoofer builds with precise 149 mm mounting holes
ROBUST ALUMINIUM BASKET - Engineered for long-lasting strength and minimal resonance

The Reckhorn D-165 Subwoofer Chassis features a durable cast aluminium basket and a powerful double magnet system, delivering 80 watts RMS at 4 ohms impedance. With a 175 mm diameter and optimized voice coil design, it offers a frequency response from 20 to 1000 Hz, perfect for custom subwoofer builds that demand deep, precise bass and reliable performance.